Magnetoviscous effect in ferrofluids with different dispersion media

Magnetoviscous Property and Hyperthermia Effect of Amorphous Nanoparticle Aqueous Ferrofluids

“…The increased viscosity induced by the applied magnetic field influences FF applications. Studies on magnetoviscous properties evaluate the viscosity variations in FFs as a function of time, temperature, shear rate, or other factors under applied magnetic fields [ 4 , 15 – 20 ]. Rajnak [ 18 ] studied the viscosity of a transformer oil-based FF and found that the electric field-induced viscosity changes are analogous to the magnetoviscous effect.…”

“…They found that the strong magnetoviscous effect leads to the assumption of big changes in the microstructure due to magnetic fields. Prior work demonstrated a significant interaction of the carrier medium and surfactant with a consideration of the magnetic behavior of FFs [ 20 ]. Research on the magnetoviscous properties of FFs remains a focal point.…”

Ferrofluids and bio-ferrofluids: looking back and stepping forward

“…Pre-existent clusters (surface coated multicore particles), 492 specific for bio-ferrofluids or the use of stearic acid (a “bad” stabilizer 132 ) instead of oleic acid as a particle coating layer 493 provides ferrofluids with much enhanced magnetoviscous effect. A ferrofluid having well-stabilized particles that resists chain formation, and another ferrofluid with poorly stabilized particles, which readily form dynamic chains upon application of a magnetic field, while the particle interaction parameter for both FFs is below 1, show very different magnetorheological behavior: 494 a shear and magnetic field-dependent viscosity and the appearance of magnetic field-dependent viscoelasticity in the less well stabilized sample.…”

“…The magnetoviscous effect in the case of two different ferrofluids, a commercial magnetite based fluid (APG513A, Ferrotec Co.) with λ* = 0.5 and a cobalt based fluid (VS1-017; synthesized by S Behrens and A Gorschinski 490 ) with λ* = 2.5, is considerably higher for the cobalt ferrofluid, as a consequence of more intense interparticle interactions and structure formation. 491 Pre-existent clusters (surface coated multicore particles), 492 specific for bio-ferrofluids or the use of stearic acid (a "bad" stabilizer 132 ) instead of oleic acid as a particle coating layer 493 provides ferrofluids with much enhanced magnetoviscous effect. A ferrofluid having well-stabilized particles that resists chain formation, and another ferrofluid with poorly stabilized particles, which readily form dynamic chains upon application of a magnetic field, while the particle interaction parameter for both FFs is below 1, show very different magnetorheological behavior: 494 a shear and magnetic field-dependent viscosity and the appearance of magnetic field-dependent viscoelasticity in the less well stabilized sample.…”

Numerical Investigation on Suppressing High Frequency Self-Excited Noises of Armature Assembly in a Torque Motor Using Ferrofluid

“…In recent years, it has begun to be applied in the fields of sensors and microflow controlling [12,13]. The magnetoviscous properties of ferrofluid after introducing magnetic field were studied [14,15]. In the case of different compositions and ratios, there is usually shear thinning phenomenon, where the viscosity of the ferrofluid decreases with the increase of shear rate [16,17].…”